2024 EJC J2 H1 PRELIM QP P2

©EJC 2024 8867/J2H1PRELIM/2024 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS 2024 General Certificate of Education Advanced Level Higher 1 CANDIDATE NAME CIVICS GROUP 2 3 - REGISTRATION NUMBER PHYSICS Structured Questions 8867/02 September 2024 2 hours READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. The use of an approved scientific calculator is expected where appropriate. Section A Answer all questions. Section B Answer any one question. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue or correction fluid. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 24 printed pages. For Examiner’s Use Section A Q1 8 Q2 11 Q3 10 Q4 9 Q5 8 Q6 14 Section B Q7 20 Q8 20 s.f. P2 Total 80

2 ©EJC 2024 8867/J2H1PRELIM/2024 Data Formulae uniformly accelerated motion             2 2 2 1 2 1 2 1 2 2 1 1 1 s at u as R / R / R u v / R t R R resistors in series resistors in parallel speed of light in free space                         8 1 19 27 31 e 27 p 23 1 A 11 2 2 2 3 00 1 60 9 11 1 10 m s 10 C 1 66 10 kg 10 kg 10 kg 6 02 10 mol 10 N m k 6 1 g m 7 s 7 6 6 9 8 c u . e . . . N G . g . m m . . elementary charge unified atomic mass constant rest mass of electron rest mass of proton the Avogadro constant gravitational constant acceleration of free fall

3 ©EJC 2024 8867/J2H1PRELIM/2024 [Turn over 1 (a) Define acceleration. …………………………………………………………………………………………………....... …………………………………………………………………………………………………...[ 1] (b) An object is released from rest in a viscous fluid. Fig. 1.1 shows the variation with time t of the acceleration a of the object as it falls in the fluid. (i) Explain why the acceleration of the object decreases with time. …………………………………………………………………………………………....... …………………………………………………………………………………………....... ………………………………………………………………………………………….. [2] (ii) Explain why the initial value of the acceleration is 9.8 m s2. …………………………………………………………………………………………....... ………………………………………………………………………………………….. [1] 0 2 4 6 8 10 0 2 4 6 8 Fig. 1.1 a / m s–2 t / s

4 ©EJC 2024 8867/J2H1PRELIM/2024 (iii) Use Fig. 1.1 to estimate the speed of the object when its acceleration is zero. Explain your working clearly. speed = ……………………… m s–1 [2] (iv) In Fig. 1.2, sketch the variation of the displacement s of the object with time t, from t = 0 s to t = 8 s. There is no need to label the displacement axis. [2] [Total: 8] s / m t / s 0 2 4 6 8 Fig. 1.2 0

5 ©EJC 2024 8867/J2H1PRELIM/2024 [Turn over 2 (a) State Newton’s First Law. ............................................................................................................................................ ........................................................................................................................................[1] (b) A block of mass 0.40 kg slides in a straight line with a constant speed of 0.30 m s−1 along a frictionless horizontal surface, as shown in Fig. 2.1. Fig. 2.1 The block hits a spring and decelerates. The speed of the block becomes zero when the spring is compressed by 8.0 cm. (i) Calculate the initial kinetic energy of the block. kinetic energy = ………………………... J [2] (ii) The variation of the compression x of the spring with the force F applied to the spring is shown in Fig. 2.2. Fig. 2.2 Determine the maximum force FMAX exerted on the spring by the block. FMAX = ………………………... N [ 3] 0.30 m s1 spring block mass 0.40 kg x / cm 8.0 FMAX F 0 0

6 ©EJC 2024 8867/J2H1PRELIM/2024 (iii) State and explain whether the block is in equilibrium 1. just before it hits the spring, ................................................................................................................................... ...............................................................................................................................[1] 2. at the moment its speed becomes zero. ................................................................................................................................... ...............................................................................................................................[1] (c) Figure 2.3 shows a massive column held stationary in position by a group of people pulling at a rope. Fig. 2.3 The 4.0 m high column has a mass of 180 kg and its centre of gravity X is at a distance of 2.3 m from the base. The rope makes an angle of 35° to the column and the column itself makes an angle of 45° to the horizontal. (i) Show that the moment exerted by the weight of the column about the base is 2.9 × 103 N m. [1] (ii) By taking moments about the base of the column, calculate the tension T in the rope. T = ………………………………. N [2] [Total: 11] 4.0 m 2.3 m 35 45 weight X T

7 ©EJC 2024 8867/J2H1PRELIM/2024 [Turn over 3 (a) An object of mass 0.80 kg is placed at a distance r from the centre P of a flat disc rotating horizontally with an angular speed . It undergoes circular motion with the disc, as shown in Fig. 3.1. To determine the maximum frictional force acting on the object, the angular speed is slowly increased until the object starts to slide. For different values of r, this value of the angular speed is recorded as max . The variation with 1 r of 2 max is shown in Fig. 3.2. P  r Fig. 3.1 (top view) object disc 5 10 9 8 7 6 / rad2 s2 5 6 7 8 9 10 / m1 Fig. 3.2

8 ©EJC 2024 8867/J2H1PRELIM/2024 (i) On Fig. 3.1, draw an arrow to show the direction of the frictional force acting on the object at the instant shown. Label this arrow Z. [1] (ii) Explain the direction of the frictional force in (a)(i). ………………………………………………………………………………………………. …………………………………………………………………………………………… [1] (b) (i) Determine the gradient of the line in Fig. 3.2. gradient = ……………………………….. [ 2] (ii) Suggest the physical significance of the gradient. Show any necessary working. ………………………………………………………………………………………………. …………………………………………………………………………………………… [2] (c) Determine the maximum frictional force acting on the object. maximum frictional force = ……………………………….. N [2] (d) Explain why the object starts to slide as angular speed increases. ……………………………………………………………………………………………… …….. ……………………………………………………………………………………………… …….. ………………………………………………………………………………………… ……. … [2] [Total: 10]

9 ©EJC 2024 8867/J2H1PRELIM/2024 [Turn over 4 (a) Explain what is meant by work done. ............................................................................................................................................ ........................................................................................................................................[1] (b) A leisure park